As I was leaving my friend's house at 1:30am I observed an unusual phenomenon. About three miles away from where I was, on his porch, there was a bright (almost as if it was a headlight) blue sphere in the sky. It was probably two football field lengths distance away from the top of the houses. It was foggy out at that time so I could not make out specific details of the "object" but the fog had a blue haze from the sphere. I'm not speculating whether or not it came from Mars, but it was a very odd event to witness. After about one minute the sphere immediately disappeared and the blue haze with it, although the fog remained. It left me feeling a little nutty because the object was so bright and had form to it and then it was like you blinked and nothing was ever there.